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Study on the estimation of Euler angles for Macao Science Satellite-1 被引量:1
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作者 Qing Yan JiaMing Ou +2 位作者 Le Suo Yi Jiang PengFei Liu 《Earth and Planetary Physics》 EI CSCD 2023年第1期144-150,共7页
The Euler angle estimation is a calibration method for vector data measured by the magnetometer on a satellite.It is used to find the relative rotation between the coordinate system of the magnetometer and the satelli... The Euler angle estimation is a calibration method for vector data measured by the magnetometer on a satellite.It is used to find the relative rotation between the coordinate system of the magnetometer and the satellite(usually determined by Star Imagers).Before launch of the low-orbit,low-inclination Macao Science Satellite-1(known as MSS-1),we simulated the estimation of Euler angles by using the magnetic measurements of the in-orbit Swarm and China Seismo-Electromagnetic Satellite(noted as CSES),with various data combinations.In this study,11 data sets were designed to analyze the estimation results for the MSS-1 orbit by using a joint estimation method of the geomagnetic field model parameters and Euler angles.For the model results,we found that all the spatial power spectral lines showed behavior consistent with that of the CHAOS-7.8 model at low degrees(corresponding to large-scale magnetic signals).The spectra of models without global data coverage deviated much more(by a maximum of~10^(4) nT^(2))from those of the CHAOS-7.8 model at higher degrees.For models with global data coverage and with various data combinations,the spectral lines were distributed similarly.Moreover,the models with accordant power spectral distributions demonstrated different Euler angle estimations.As more vector data at higher latitudes were included,the estimated Euler angles varied monotonically in all three directions.The models with vector data in the same latitude range showed similar Euler angle results,regardless of whether the poleward scalar data were included.The largest value difference was found between the models using vector data within±40°latitudes and those using vector data within±60°latitudes,which reached to~28″.Therefore,we concluded that the inversion of the spherical harmonic Gauss coefficients in our tests was mainly affected by the spatial coverage range of the data,whereas the estimation of Euler angles largely depended on the latitude range where the vector data could be obtained.These results can be used for future in-flight data testing.We expect the estimation of Euler angles to improve as other methods are adopted. 展开更多
关键词 Macao Science Satellite-1(MSS-1) geomagnetic fields Euler angle estimation low-inclination orbit
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Online asymmetry estimation for whole angle mode coriolis vibratory gyroscopes by high frequency injection 被引量:1
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作者 Xiang-rui Meng Chong Li Yu-chen Wang 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2023年第6期314-325,共12页
The whole angle mode gyroscope(WAMG)is considered to be the next generation architecture,but it is suffered from the asymmetry errors to conduct real products.This paper proposes a novel high frequency injection based... The whole angle mode gyroscope(WAMG)is considered to be the next generation architecture,but it is suffered from the asymmetry errors to conduct real products.This paper proposes a novel high frequency injection based approach for the error parameters online identification for the WAMG.The significance is that it can separate physical and error fingerprints to enable online calibration.The nonlinear WAMG dynamics are discretized to meet the requirement of numerical precision and computation efficiency.The optimized estimation methods are then constructed and compared to track asymmetry error parameters continuously.In the validation part,its results firstly prove that the proposed scheme can accurately identify constant asymmetry parameters with an overall tracking error of less than 1 ppm and the extreme numerical convergence can reach 10^(-12)ppm.Under the dynamic asymmetry variation condition,the root mean square errors(RMSE)indicate that the tracking accuracy can reach the level of10^(-3),which shows the robustness of the proposed scheme.In summary,the proposed method can effectively estimate the WAMG asymmetry errors online with satisfied performance and practical values. 展开更多
关键词 Rate-integrating gyroscope(RIG) Whole angle mode gyroscope(WAMG) Coriolis vibrating gyroscope(CVG) Online calibration Online identification Online estimation
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Angle estimation in bistatic MIMO radar using improved reduced dimension Capon algorithm 被引量:14
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作者 Xiaofei Zhang Dazhuan Xu 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2013年第1期84-89,共6页
This paper discusses the problem of direction of departure (DOD) and direction of arrival (DOA) estimation for a bistatic multiple input multiple output (MIMO) radar, and proposes an improved reduced-dimension C... This paper discusses the problem of direction of departure (DOD) and direction of arrival (DOA) estimation for a bistatic multiple input multiple output (MIMO) radar, and proposes an improved reduced-dimension Capon algorithm therein. Compared with the reduced-dimension Capon algorithm which requires pair matching between the two-dimensional angle estimation, the pro- posed algorithm can obtain automatically paired DOD and DOA estimation without debasing the performance of angle estimation in bistatic MIMO radar. Furthermore, the proposed algorithm has a lower complexity than the reduced-dimension Capon algorithm, and it is suitable for non-uniform linear arrays. The complexity of the proposed algorithm is analyzed and the Cramer-Rao bound (CRB) is also derived. Simulation results verify the usefulness of the proposed algorithm. 展开更多
关键词 multiple input multiple output (MIMO) radar angle estimation Capon algorithm non-uniform array.
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Elevation estimation for low-angle target based on reffection paths suppression 被引量:2
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作者 Hou Yuguan Shen Yiying Zhang Zhongzhao 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2008年第1期71-75,共5页
In the signal processing for metrewave radar, the reflection paths of target echoes can cause severe error in the elevation estimation for the low-angle target tracking. The exact angles of the reflection paths are un... In the signal processing for metrewave radar, the reflection paths of target echoes can cause severe error in the elevation estimation for the low-angle target tracking. The exact angles of the reflection paths are unknown beforehand, and therefore, the reflection paths can not be suppressed easily. Therefore, in this article, an improved reflection paths suppression approach is presented. A block matrix aggregate is constructed based on the possible angles of the reflection paths. Combined with the beamforming-like processing, a generalized maximum likelihood estimation is derived to optimize the estimation. Moreover, the noise reduction method based on the Toeplitz covariance matrix is used for better performance. This approach is applied to the real data collected by the low-angle tracking radar with 8-channel vertical array. The experiment results show that the reflection effects are reduced and the accuracy of the elevation estimate is improved. 展开更多
关键词 elevation estimation low-angle target tracking reflection paths suppression generalized maximum likelihood estimation.
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Refractivity estimations from an angle-of-arrival spectrum 被引量:2
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作者 赵小峰 黄思训 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第2期586-591,共6页
This paper addresses the probability of atmospheric refractivity estimation by using field measurements at an array of radio receivers in terms of angle-of-arrival spectrum. Angle-of-arrival spectrum information is si... This paper addresses the probability of atmospheric refractivity estimation by using field measurements at an array of radio receivers in terms of angle-of-arrival spectrum. Angle-of-arrival spectrum information is simulated by the ray optics model and refractivity is expressed in the presence of an ideal tri-linear profile. The estimation of the refractivity is organized as an optimization problem and a genetic Mgorithm is used to search for the optimal solution from various trial refractivity profiles. Theoretical analysis demonstrates the feasibility of this method to retrieve the refractivity parameters. Simulation results indicate that this approach has a fair anti-noise ability and its accuracy performance is mainly dependent on the antenna aperture size and its positions. 展开更多
关键词 refractivity estimation angle-of-arrival spectrum ray optics model genetic algorithm
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Real-domain GMUSIC algorithm based on unitary-transform for low-angle estimation 被引量:1
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作者 Zheng Liu Yuanyuan Wang Yunhe Cao 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2014年第5期794-799,共6页
In order to realize the elevation angle estimation for low-altitude targets at a low computational cost, a generalized multiple signal classification (GMUSIC) algorithm based on unitary transform is proposed, i.e., ... In order to realize the elevation angle estimation for low-altitude targets at a low computational cost, a generalized multiple signal classification (GMUSIC) algorithm based on unitary transform is proposed, i.e., the DU-GMUSlC algorithm. Firstly, the covariance matrix of received data is used to construct the Centro- Hermitian matrix. Then, the real-domain GMUSIC algorithm is used to implement the initial angle estimation, and the multipath attenuation coefficient is calculated in succession. Finally, the attenuation coefficient is taken into account in the GMUSIC method to carry out the secondary angle estimation which is beneficial to further improvement of the angle estimation accuracy. This method can meet requirements of low-angle accuracy as well as lower computational burden. Simulation results prove the correctness and effectiveness of the proposed algorithm. Moreover, field experiment data are used to further validate the effectiveness of this method. 展开更多
关键词 multipath effect low-angle estimation unitary transform. attenuation coefficient.
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Beamforming and Angle-of-Arrival Estimation of Square Planar Antenna Array
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作者 R. Elsamnty A. M. Attiya +1 位作者 E. A. F. Abdallah A. H. Ammar 《Open Journal of Antennas and Propagation》 2016年第2期13-23,共11页
This paper presents a dual-band planar antenna array for ISM band applications (2.4 GHz and 2.45 GHz). This antenna is proposed for indoor applications and enables adaptive beamforming and angle of arrival (AOA) estim... This paper presents a dual-band planar antenna array for ISM band applications (2.4 GHz and 2.45 GHz). This antenna is proposed for indoor applications and enables adaptive beamforming and angle of arrival (AOA) estimation. An adaptive beamforming algorithm is applied for a planar antenna array, which is able to steer its main beam and nulls in azimuth and elevation planes over a wide frequency band. Planar antenna array operates as a spatial filter in 3D space, processing the received signals with weighting schemes. A planar antenna array is designed for AOA estimation in azimuth and elevation planes by using MUltiple SIgnal Classification (MUSIC) based on subspace algorithm. The Base Station (BS) equipped with this planar antenna is preferred to be at the center position on the room ceiling to cover all sectors of the room. It is designed to use four directional triangular elements arranged to form a square planar antenna array. Planar antenna with four elliptical slotted triangular elements (PAFESTE) is used to obtain optimal directivity in four directions in azimuth plane with specific orientation of 30? in elevation plane. It is characterized by half power beamwidth in elevation plane of about 60? and half power beamwidth in azimuth plane of about 90?. 展开更多
关键词 Indoor Communications Antenna Array Directional Planar Antenna angle of Arrival estimation Adaptive Beamforming
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THE ANGLE ERROR ESTIMATE METHOD IN THE WIDE SWATH SAR BASING ON MULTI-RECEIVER 被引量:1
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作者 Wang Xiaoqing Zhu Minhui Sheng Xinqing 《Journal of Electronics(China)》 2006年第3期374-378,共5页
The wide-swath method based on multi-receiver is a novel and highly accurate wide-swath method, which requires a very precise view angle. The estimated angle has error because of the atmosphere refraction, angle error... The wide-swath method based on multi-receiver is a novel and highly accurate wide-swath method, which requires a very precise view angle. The estimated angle has error because of the atmosphere refraction, angle error of view and target height. A method is proposed in this paper to estimate the angle error from the return signal. The method makes use of the relationship between the view angle error and the signal correlation of the subswaths to estimate the angle error. The precision of this method is analyzed by the law of great number and it turns out to be in direct proportion to the root square number of averaging. The simulation result is given and the angle precision is 0.025°. 展开更多
关键词 Synthetic Aperture Radar (SAR) Multi-receiver angle error estimation
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Rapid vision-based system for secondary copper content estimation 被引量:2
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作者 张宏伟 葛志强 +2 位作者 袁小锋 宋执环 叶凌箭 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第8期2665-2676,共12页
A vision-based color analysis system was developed for rapid estimation of copper content in the secondary copper smelting process. Firstly, cross section images of secondary copper samples were captured by the design... A vision-based color analysis system was developed for rapid estimation of copper content in the secondary copper smelting process. Firstly, cross section images of secondary copper samples were captured by the designed vision system. After the preprocessing and segmenting procedures, the images were selected according to their grayscale standard deviations of pixels and percentages of edge pixels in the luminance component. The selected images were then used to extract the information of the improved color vector angles, from which the copper content estimation model was developed based on the least squares support vector regression (LSSVR) method. For comparison, three additional LSSVR models, namely, only with sample selection, only with improved color vector angle, without sample selection or improved color vector angle, were developed. In addition, two exponential models, namely, with sample selection, without sample selection, were developed. Experimental results indicate that the proposed method is more effective for improving the copper content estimation accuracy, particularly when the sample size is small. 展开更多
关键词 secondary copper copper content estimation sample selection color vector angle least squares support vector regression
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Vehicle Dynamic State Estimation: State of the Art Schemes and Perspectives 被引量:12
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作者 Hongyan Guo Dongpu Cao +3 位作者 Hong Chen Chen Lv Huaji Wang Siqi Yang 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2018年第2期418-431,共14页
Next-generation vehicle control and future autonomous driving require further advances in vehicle dynamic state estimation. This article provides a concise review, along with the perspectives, of the recent developmen... Next-generation vehicle control and future autonomous driving require further advances in vehicle dynamic state estimation. This article provides a concise review, along with the perspectives, of the recent developments in the estimation of vehicle dynamic states. The definitions used in vehicle dynamic state estimation are first introduced, and alternative estimation structures are presented. Then, the sensor configuration schemes used to estimate vehicle velocity, sideslip angle, yaw rate and roll angle are presented. The vehicle models used for vehicle dynamic state estimation are further summarized, and representative estimation approaches are discussed. Future concerns and perspectives for vehicle dynamic state estimation are also discussed. 展开更多
关键词 Index Terms-estimation structure extended Kalman filter sensor configuration sideslip angle estimation vehicle dynamicstate estimation vehicle dynamics model.
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Fast multi-parameter estimation and localization for MIMO radar 被引量:4
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作者 Lingyun Xu Xiaofei Zhang Miao Yu 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2015年第3期486-492,共7页
This paper addresses the problem of four-dimensional angle and Doppler frequency estimation for bistatic multiple-input multiple-output (MIMO) radar with arbitrary arrays in spatial co- lored noise. A novel method f... This paper addresses the problem of four-dimensional angle and Doppler frequency estimation for bistatic multiple-input multiple-output (MIMO) radar with arbitrary arrays in spatial co- lored noise. A novel method for joint estimation of Doppler fre- quency, two-dimensional (2D) direction of departure and 2D direc- tion of arrival based on the propagator method (PM) for arbitrary arrays is discussed. A special matrix is constructed to eliminate the influence of spatial colored noise. The four-dimensional (4D) angle and Doppler frequency are extracted from the matrix and the three- dimensional (3D) coordinates of the targets are then calculated on the basis of these angles. The proposed algorithm provides a lower computational complexity and has a parameter estimation very close to that of the ESPRIT algorithm and the DOA-matrix al- gorithm in the high signal to noise ratio and the Cramer-Rao bound (CRB) is given. Furthermore, multi-dimensional parameters can be automatically paired by this algorithm to avoid performance degra- dation resulting from wrong pairing. Simulation results demonstrate the effectiveness of the proposed method. 展开更多
关键词 four-dimensional (4D) angle estimation Doppler frequency estimation propagator method (PM) multiple-input multiple-output (MIMO) radar arbitrary array spatial colored noise.
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Frequency domain polarization weighted ESPRIT method for bearing angle 被引量:2
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作者 Wei Liu Shengchun Piao +2 位作者 Junyuan Guo Qingxin Meng Hanhao Zhu 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2014年第5期769-775,共7页
The signal to noise ratio (SNR) of seismic waves is usually very low after long distance transmission. For this condition, to improve the bearing estimation capability in the low SNR, a frequency domain polarization... The signal to noise ratio (SNR) of seismic waves is usually very low after long distance transmission. For this condition, to improve the bearing estimation capability in the low SNR, a frequency domain polarization weighted ESPRIT method using a single vector device is proposed. The frequency domain polari- zation parameters extracted from the signals are used to design the weighted function which is applied to the received signals. The bearing angle and the target frequency are estimated through ESPRIT using the weighted signals. The simulation and experiment results show that the presented method can obtain accurate estimation values under the low SNR with little prior information. 展开更多
关键词 vector seismic signal frequency domain polarizationweight bearing angle estimation estimation of signal parametersvia rotational invariance techniques (ESPRIT).
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Computationally Efficient MUSIC-Based Algorithm for Joint Direction of Arrival (DOA) and Doppler Frequency Estimation in Monostatic MIMO Radar 被引量:1
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作者 Cao Renzheng Zhang Xiaofei 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2018年第6期1053-1063,共11页
The problem of joint direction of arrival (DOA) and Doppler frequency estimation in monostatic multiple-input multiple-output (MIMO) radar is studied and a computationally efficient multiple signal classification (CE-... The problem of joint direction of arrival (DOA) and Doppler frequency estimation in monostatic multiple-input multiple-output (MIMO) radar is studied and a computationally efficient multiple signal classification (CE-MUSIC) algorithm is proposed.Conventional MUSIC algorithm for joint DOA and Doppler frequency estimation requires a large computational cost due to the two dimensional (2D) spectral peak searching.Aiming at this shortcoming,the proposed CE-MUSIC algorithm firstly uses a reduced-dimension transformation to reduce the subspace dimension and then obtains the estimates of DOA and Doppler frequency with only one-dimensional (1D) search.The proposed CE-MUSIC algorithm has much lower computational complexity and very close estimation performance when compared to conventional 2D-MUSIC algorithm.Furthermore,it outperforms estimation of signal parameters via rotational invariance technique (ESPRIT) algorithm.Meanwhile,the mean squared error (MSE) and Cramer-Rao bound (CRB) of joint DOA and Doppler frequency estimation are derived.Detailed simulation results illustrate the validity and improvement of the proposed algorithm. 展开更多
关键词 MULTIPLE-INPUT multiple-output(MIMO)radar RADAR SIGNAL processing JOINT angle and Doppler frequency estimation multiple SIGNAL classification(MUSIC)waveform generation optical switching
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Target Localization Based on Angle of Arrivals 被引量:4
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作者 Yi-Chao Cao 《Journal of Electronic Science and Technology of China》 2007年第2期172-174,共3页
Mobile location using angle of arrival (AOA) measurements has received considerable attention. This paper presents an approximation of maximum likelihood estimator (MLE) for localizing a source based on AOA measur... Mobile location using angle of arrival (AOA) measurements has received considerable attention. This paper presents an approximation of maximum likelihood estimator (MLE) for localizing a source based on AOA measurements. By introducing an intermediate variable, the nonlinear equations relating AOA estimates can be transformed into a set of equations which are linear in the unknown parameters. It is an approximate realization of the MLE. Simulations show that the proposed algorithm outperforms the previous contribution. 展开更多
关键词 angle of arrival (AOA) direction-of-arrival estimation location estimation Monte Carlo methods wireless localization.
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A target group tracking algorithm for wireless sensor networks using azimuthal angle of arrival information
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作者 张淳 费树岷 周杏鹏 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第12期1-10,共10页
In this paper, we explore the technology of tracking a group of targets with correlated motions in a wireless sensor network. Since a group of targets moves collectively and is restricted within a limited region, it i... In this paper, we explore the technology of tracking a group of targets with correlated motions in a wireless sensor network. Since a group of targets moves collectively and is restricted within a limited region, it is not worth consuming scarce resources of sensors in computing the trajectory of each single target. Hence, in this paper, the problem is modeled as tracking a geographical continuous region covered by all targets. A tracking algorithm is proposed to estimate the region covered by the target group in each sampling period. Based on the locations of sensors and the azimuthal angle of arrival (AOA) information, the estimated region covering all the group members is obtained. Algorithm analysis provides the fundamental limits to the accuracy of localizing a target group. Simulation results show that the proposed algorithm is superior to the existing hull algorithm due to the reduction in estimation error, which is between 10% and 40% of the hull algorithm, with a similar density of sensors. And when the density of sensors increases, the localization accuracy of the proposed algorithm improves dramatically. 展开更多
关键词 wireless sensor network target group TRACKING azimuthal angle estimation error
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STUDY ON MONOPULSE ANGLE MEASUREMENT METHOD BASED ON VIRTUAL POLARIZATION MATCHING
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作者 Huang Yangang Xu Zhenhai Xiong Ziyuan 《Journal of Electronics(China)》 2013年第5期447-453,共7页
A monopulse angle measurement method for polarization array radar is studied in this paper.The receiving signal model is established and then a monopulse angle measurement method based on virtual polarization matching... A monopulse angle measurement method for polarization array radar is studied in this paper.The receiving signal model is established and then a monopulse angle measurement method based on virtual polarization matching is proposed.To analyze the estimation performance,the Cramer-Rao Lower Bound(CRLB)of angle estimation is derived.Both theoretical analysis and simulation show that:firstly,the proposed method is superior to the traditional angle measurement methods based on the single polarization.Secondly,the performance of the new method is unrelated to the echo polarization.Thirdly,angle estimation of this method is asymptotically optimal.The results show that this method has great potential to be used in polarization array radar. 展开更多
关键词 Polarization array radar Monopulse angle measurement Polarization estimation Virtual polarization matching
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Accurate Angle-of-Arrival Measurement Using Particle Swarm Optimization
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作者 Minghui Li Kwok Shun Ho Gordon Hayward 《Wireless Sensor Network》 2010年第5期358-364,共7页
As one of the major methods for location positioning, angle-of-arrival (AOA) estimation is a significant technology in radar, sonar, radio astronomy, and mobile communications. AOA measurements can be exploited to loc... As one of the major methods for location positioning, angle-of-arrival (AOA) estimation is a significant technology in radar, sonar, radio astronomy, and mobile communications. AOA measurements can be exploited to locate mobile units, enhance communication efficiency and network capacity, and support location-aided routing, dynamic network management, and many location-based services. In this paper, we propose an algorithm for AOA estimation in colored noise fields and harsh application scenarios. By modeling the unknown noise covariance as a linear combination of known weighting matrices, a maximum likelihood (ML) criterion is established, and a particle swarm optimization (PSO) paradigm is designed to optimize the cost function. Simulation results demonstrate that the paired estimator PSO-ML significantly outperforms other popular techniques and produces superior AOA estimates. 展开更多
关键词 Array Signal Processing angle-OF-ARRIVAL (AOA) estimation Location POSITIONING Particle SWARM Optimization Smart ANTENNAS
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PMSM正切趋近律无位置传感器角度补偿方法研究 被引量:2
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作者 徐奇伟 蒋东昊 +3 位作者 王益明 张雪锋 刘津成 陈杨明 《电机与控制学报》 EI CSCD 北大核心 2024年第1期26-34,共9页
在负载转矩突变的动态过程中,基于PI调节器的角度补偿方法作用时PMSM超螺旋滑模观测器(STSMO)转子电角度估算误差波动剧烈,因此依据角度估算误差的定义,建立了转子电角度补偿算法的数学模型。根据滑模控制和趋近律理论,提出了基于正切... 在负载转矩突变的动态过程中,基于PI调节器的角度补偿方法作用时PMSM超螺旋滑模观测器(STSMO)转子电角度估算误差波动剧烈,因此依据角度估算误差的定义,建立了转子电角度补偿算法的数学模型。根据滑模控制和趋近律理论,提出了基于正切趋近律的变步长闭环角度补偿方法,选择角度估算误差的半角正切值作为角度调节步长,并通过前馈解耦得到的角度估算误差正余弦信号计算该步长,实现了对无位置传感器控制系统动态性能和抗扰动能力的改善。根据归一化灵敏度的定义,分析调节步长随角度估算误差变化的灵敏度,提出了基于归一化补偿灵敏度的系统动态性能分析方法,衡量两种补偿算法作用下系统的动态性能。计算和仿真结果表明,正切趋近律补偿方法具有更高的归一化补偿灵敏度,在负载转矩突变等角度估算误差变化剧烈的工况下能够实现更好的补偿效果,抑制估算角度误差的波动。实验结果表明,相比传统的PI补偿方法,正切趋近律补偿方法能够将突加额定转矩动态过程中角度估算误差的波动幅度降低61.9%,动态过程持续时间缩短23%,有效提升了系统的动态性能和抗扰动能力。 展开更多
关键词 永磁同步电机 无位置传感器控制 超螺旋滑模观测器 角度估算误差 PI补偿方法 滑模控制 正切趋近律 归一化补偿灵敏度
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综合孔径微波辐射计的射频干扰源空间角度稀疏贝叶斯估计方法
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作者 张娟 庄乐慧 +2 位作者 李一楠 李虹 窦昊锋 《电子与信息学报》 EI CAS CSCD 北大核心 2024年第8期3202-3209,共8页
该文提出一种综合孔径微波辐射计射频干扰源(RFI)空间稀疏贝叶斯估计方法。首先建立了综合孔径微波辐射计可见度函数干涉测量模型,观测数据表示为综合孔径天线基线对相关导向矢量观测矩阵与视场亮温的乘积,由于相关导向矢量观测矩阵的... 该文提出一种综合孔径微波辐射计射频干扰源(RFI)空间稀疏贝叶斯估计方法。首先建立了综合孔径微波辐射计可见度函数干涉测量模型,观测数据表示为综合孔径天线基线对相关导向矢量观测矩阵与视场亮温的乘积,由于相关导向矢量观测矩阵的正交性和RFI空间角度分布的稀疏性,亮温在基线对相关导向矢量观测矩阵正交基所构成的支撑域中的变换系数是稀疏的。该文在稀疏贝叶斯学习(SBL)框架下对亮温进行稀疏重构。该方法在无需稀疏度和正则化参数等先验信息前提下也能获得较高的重构性能。计算机仿真验证了该方法的有效性。 展开更多
关键词 综合孔径微波辐射计 射频干扰源 稀疏贝叶斯 空间角度估计
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空域色噪声下的多输入多输出雷达角度估计
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作者 陈金立 唐熠君 +1 位作者 朱熙铖 李家强 《科学技术与工程》 北大核心 2024年第14期5855-5862,共8页
由于多输入多输出(multiple input multiple output,MIMO)雷达的空域色噪声协方差矩阵通常为非对角矩阵,因此在色噪声下信号子空间与噪声子空间无法有效分离,从而致使传统算法无法有效估计目标角度。为此,首先利用信号协方差矩阵的低秩... 由于多输入多输出(multiple input multiple output,MIMO)雷达的空域色噪声协方差矩阵通常为非对角矩阵,因此在色噪声下信号子空间与噪声子空间无法有效分离,从而致使传统算法无法有效估计目标角度。为此,首先利用信号协方差矩阵的低秩性和色噪声协方差矩阵的稀疏性来抑制空域色噪声。然后,根据MIMO雷达数据的内在多维结构特性,建立四阶张量CP(canonical or parallel factor analysis,CANDECOMP/PARAFAC)分解模型。针对传统交替最小二乘算法对数值病态性较为敏感而导致CP分解精度低的问题,利用张量因子矩阵之间的共轭关系来降低求解的病态敏感度,提高张量分解的稳健性。最后,利用最小二乘拟合法从因子矩阵的估计值中得到目标角度。仿真结果表明,所提算法能够对色噪声有效抑制并提高了角度估计的精度。 展开更多
关键词 空域色噪声 MIMO雷达 低秩和稀疏分解 张量分解 角度估计
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